互补性和选择性相对重要性的转变推动了社区均性对财富-不可侵袭性关系的不同影响
Jiang Wang1, Yuan Ge2, James Bever3
1School of Life Sciences/Zhejiang Province Key Laboratory of Plant Evolution Ecology and Conservation, Taizhou University, Taizhou, Zhejiang, People's Republic of China.
Proceedings. Biological sciences
|July 1, 2025
概括
社区的均性影响了物种丰富程度如何影响抗入侵能力,这取决于地点条件. 这种关系是由原生植物和入侵者之间的资源竞争 (如水或光) 的变化所驱动的.
科学领域:
- 生态生态学 生态生态学
- 植物共同体生态学 植物共同体生态学
- 侵袭生物学 侵袭生物学
背景情况:
- 生物多样性影响生态系统的运作,物种丰富性可能会影响对入侵物种的抵抗力.
- 物种均性在丰富性-不可入侵性关系中的作用及其上下文依赖性在很大程度上仍未被探索.
研究的目的:
- 调查物种均性如何改变植物物种丰富性和社区入侵性之间的关系.
- 要确定这些效应是否取决于上下文,在xeric和mesic网站之间有所不同.
- 阐明驱动这些关系的潜在机制 (互补性与选择性).
主要方法:
- 植物群落的实验性构建,其物种丰富性和均性各不相同.
- 在这些社区引入入侵性的一年生植物 *Conyza canadensis*.
- 评估跨 xeric 和 mesic 环境条件的社区入侵性.
主要成果:
- 在xeric地点,入侵性随着物种丰富度在高和低均度下降,主要是由于土壤补充用水.
- 在 mesic 位点中,入侵性降低,丰富性仅在高均度下降,这是由于对优势物种的选择,这些物种在轻度竞争中优越.
- 改变的均性改变了物种间的高度差异,影响了光的竞争,从而影响了mesic站点中的丰富性-侵入性关系.
结论:
- 社区均性对财富-不可入侵性关系的影响取决于环境,根据地点条件 (xeric vs mesic) 变化.
- 诸如资源互补性 (水) 和选择效应 (光竞争) 等机制调解了这些关系.
- 物种均性的变化改变了社区的功能特征,影响了资源利用,从而影响了对入侵的抵抗力.
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